Aug 28 (Reuters) - Wall Street was set to open slightly higher on Monday, even as investors assessed the impact of Tropical Storm Harvey on the U.S. economy.

Stocks of refiners, pipeline operators, insurers and home improvement retailers will be in focus after Harvey was set to dump more rain on Houston on Monday, worsening flooding that has paralyzed the country’s energy hub.

Harvey has knocked out a quarter of oil production from the Gulf of Mexico, prompting fears it could overturn years of excess U.S. oil capacity and low prices.

U.S. crude futures, which earlier hit two-year highs, dipped more than 1 percent to $47.38 over concerns that refinery shutdowns could reduce demand for American crude.

“The unfortunate event from Hurricane Harvey will have some sort of impact on the numbers, down the line ... at this point, it does not appear to affect equities,” said Andre Bakhos, managing director at Janlyn Capital.

U.S. economic growth had more than halved in the quarter after Hurricane Katrina mauled Louisiana in August 2005.

“The Wall Street population is thinner than usual, and we’ve had no fresh news of any type, whether it’s on the geopolitical front or from the administration, that has materially impacted traders’ outlook,” said Bakhos.